package db

import (
	"database/sql"
	"fmt"
	"slices"

	"github.com/Flashfyre/pokerogue-server/defs"
	_ "github.com/go-sql-driver/mysql"
)

func AddAccountRecord(uuid []byte, username string, key, salt []byte) error {
	_, err := handle.Exec("INSERT INTO accounts (uuid, username, hash, salt, registered) VALUES (?, ?, ?, ?, UTC_TIMESTAMP())", uuid, username, key, salt)
	if err != nil {
		return err
	}

	return nil
}

func AddAccountSession(username string, token []byte) error {
	_, err := handle.Exec("INSERT INTO sessions (uuid, token, expire) SELECT a.uuid, ?, DATE_ADD(UTC_TIMESTAMP(), INTERVAL 1 WEEK) FROM accounts a WHERE a.username = ?", token, username)
	if err != nil {
		return err
	}

	_, err = handle.Exec("UPDATE accounts SET lastLoggedIn = UTC_TIMESTAMP() WHERE username = ?", username)
	if err != nil {
		return err
	}

	return nil
}

func UpdateAccountLastActivity(uuid []byte) error {
	_, err := handle.Exec("UPDATE accounts SET lastActivity = UTC_TIMESTAMP() WHERE uuid = ?", uuid)
	if err != nil {
		return err
	}

	return nil
}

func UpdateAccountStats(uuid []byte, stats defs.GameStats) error {
	var columns = []string{"playTime", "battles", "classicSessionsPlayed", "sessionsWon", "highestEndlessWave", "highestLevel", "pokemonSeen", "pokemonDefeated", "pokemonCaught", "pokemonHatched", "eggsPulled"}

	var statCols []string
	var statValues []interface{}

	m, ok := stats.(map[string]interface{})
	if !ok {
		return fmt.Errorf("expected map[string]interface{}, got %T", stats)
	}

	for k, v := range m {
		value, ok := v.(float64)
		if !ok {
			return fmt.Errorf("expected float64, got %T", v)
		}

		if slices.Contains(columns, k) {
			statCols = append(statCols, k)
			statValues = append(statValues, value)
		}
	}

	var statArgs []interface{}
	statArgs = append(statArgs, uuid)
	for range 2 {
		statArgs = append(statArgs, statValues...)
	}

	query := "INSERT INTO accountStats (uuid"

	for _, col := range statCols {
		query += ", " + col
	}

	query += ") VALUES (?"

	for range len(statCols) {
		query += ", ?"
	}

	query += ") ON DUPLICATE KEY UPDATE "

	for i, col := range statCols {
		if i > 0 {
			query += ", "
		}

		query += col + " = ?"
	}

	_, err := handle.Exec(query, statArgs...)
	if err != nil {
		return err
	}

	return nil
}

func FetchUsernameFromToken(token []byte) (string, error) {
	var username string
	err := handle.QueryRow("SELECT a.username FROM accounts a JOIN sessions s ON s.uuid = a.uuid WHERE s.token = ? AND s.expire > UTC_TIMESTAMP()", token).Scan(&username)
	if err != nil {
		return "", err
	}

	return username, nil
}

func FetchAccountKeySaltFromUsername(username string) ([]byte, []byte, error) {
	var key, salt []byte
	err := handle.QueryRow("SELECT hash, salt FROM accounts WHERE username = ?", username).Scan(&key, &salt)
	if err != nil {
		return nil, nil, err
	}

	return key, salt, nil
}

func FetchUuidFromToken(token []byte) ([]byte, error) {
	var uuid []byte
	err := handle.QueryRow("SELECT uuid FROM sessions WHERE token = ? AND expire > UTC_TIMESTAMP()", token).Scan(&uuid)
	if err != nil {
		if err == sql.ErrNoRows {
			return nil, err
		}

		return nil, err
	}

	return uuid, nil
}

func RemoveSessionFromToken(token []byte) error {
	_, err := handle.Exec("DELETE FROM sessions WHERE token = ?", token)
	if err != nil {
		return err
	}

	return nil
}